Switzerland has a fertility rate of about 1.4 and decreasing, unless they do something, there won't be much of a country left in a few generations. Solutions can involve immigration or natalism, but something has to change.
Japan is worse.
Japan is worse.
The birth rates of the immigrant waves would presumably just plummet quickly anyway as they join the culture. Since that seems to have happened with all our other health problems.
you can piddle around about a few tiny islands elsewhere, e.g. okinawa, but the main islands are undisputedly "japan"
Japanese population is still over 120 million. Forecasts put it falling below 100 million at some point in the second half of this century.
Things will have to change in order to keep population stable in the long term, but the Japanese approach seems IMHO more sensible than that of other countries.
Cohesive democratic societies are fragile.
Emphasis on slightly younger. Fertility is declining basically everywhere. Much of the developing world is now below replacement including India and China.
The aged society scam can only persist as long as they can exploit the younger generation. When that collapses, the end result is either going to be leaving the elderly to die or things start collapsing in new and interesting ways
The only reason why people 'prefer' this is for the same reason 'prefer' to believe climate change doesn't exist. Eventually reality catches up.
Immigration is not a long term solution to an aged society. The societies of target countries are aging as well and not far behind.
What you advocate is to bolster the work force of a country with a fertility rate of ~1 and falling, with people from a place with a fertility rate of ~2 and falling.